Thanks for that. I put the substrate in the tank and I think that is exactly the depth. I need to add more water as only 6L in there at the moment but it does look too much soil to my eyes at the moment but that's probably just because I only had half that before and I just need to get used to it like that. I will half fill the tank (hopefully get that done today) ready to start putting the plants and decorations back in and then decide, but it is a great help to know that that is the depth others use and works ok!
Thanks again shrimp the world.
Id put in maybe a liter or 2 of water (1cm of water in the tank) and put in a couple handfuls of substrate at the base just to help, the other substrate to them cover it which will have the main contact with your water allowing for the buffering effects (and the colour difference if there is one wont be noticed).
I currently have a small pipe heater in the current tank that i can use for the new one, that technically makes my new project cheaper because i now don't need 2. can i get dimensions of this thank fully assembled including the top cover just so i can determine if i need to adapt my shelving. i don't mind poking out a corner of the tank from the shelf so i can do water changes and i can lift the tank onto another surface for heavy maintenance if necessary. Im really just interested if there is space for feeding without moving the tank.